I tested the github Version 0.9 too. Included the axisConstraints (it was commented out stangely). But Setting it to y.Constraints = new CPTConstraints{Lower=CPTConstraint.Fixed, Upper= CPTConstraint.None}; is crashing the app.
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Obiwan007Feb 24 '13 at 13:04

Can you update to a newer version of Core Plot? The official repository lives on Google Code. The current release is 1.1 and there have been some bug fixes and other changes since then.
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Eric SkrochFeb 24 '13 at 16:33

The Problem with updating is, that I am not the author of the MonoTouch binding project. I suspect that the MonoTouch binding of the Constraints is not complete - as I am not able to assign an CPTConstrainedPosition to the axisConstraint property. I tried the 1.1 version just via replacing it and keep the old binding definitions but it seems not to work either. Maybe we need some MonoTouch binding expert now :)
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Obiwan007Feb 25 '13 at 8:19